<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
	</head>
	<body>
		<script type="text/javascript">
			function js (a) {
				a= 2
				console.log(a)
			}
			
			var b = 1
			js(b);
			console.log(b)
		</script>
	</body>
</html>
